Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

222-9+11+12:2*14+14 = ? ( )

Toán Lớp 10: cm : 1+tan ^2 a(an pha) =1/cos^2a(a khác 90 độ)

Toán Lớp 10: cm : 1+tan ^2 a(an pha) =1/cos^2a(a khác 90 độ)

Comments ( 1 )

  1. Tính chất:
    sin^2 α+cos^2α=1
    tanα={sinα}/{cosα} (α\ne 90°)
    Ta có:
    \qquad 1+tan^2α
    =1+{sin^2α}/{cos^2 α}
    ={cos^2α+sin^2α}/{cos^2α}
    =1/{cos^2α}
    Vậy: 1+tan^2α=1/{cos^2α} (α\ne 90°)

Leave a reply

222-9+11+12:2*14+14 = ? ( )

About Thảo